Copy the password protection file you want to crack and paste it into the new 'crack' folder. Create a new folder in the 'Run' folder and name it 'crack'. Step 2: Open the folder you just saved, 'John', and click on the 'Run' folder. UnRAR your RAR file and save it in a folder named 'John'. Step 1: Download the John the Ripper CMD line tool on your computer. How to Decrypt RAR File Password with CMD? If you want to crack RAR password without software, and you are also an expert in computer technology, then you can bypass RAR password with CMD.